@media screen and(max-width:767px) {
    .container{
        width: 100%;
    }
}
@media screen and(min-width:768px) {
    .container{
        width:850px ;
    }
}
@media screen and(min-width:992px) {
    .container{
        width:970px ;
    }
}
@media screen and(min-width:1200px) {
    .container{
        width:1170px ;
    }
}
.navbar-default .navbar-nav>.active>a, .navbar-default .navbar-nav>.active>a:focus, .navbar-default .navbar-nav>.active>a:hover {
    color: #555;
    background-color: #f8f8f8;
}
.dd{
    background-color: #e7e7e7;
}